Title :
Design of a Multiband Quasi-Yagi-Type Antenna With CPW-to-CPS Transition
Author :
Ding, Yang ; Jiao, Y.-C. ; Fei, P. ; Li, B. ; Zhang, Q.T.
Author_Institution :
Nat. Key Lab. of Antennas & Microwave Technol., Xidian Univ., Xi´´an, China
fDate :
7/3/1905 12:00:00 AM
Abstract :
A novel coplanar waveguide-fed planar quasi-Yagi antenna for multiband operation is presented in this letter. The antenna consists of a basic quasi-Yagi element and a coplanar-waveguide-to-coplanar-strip (CPW-to-CPS) transition, which can excite the odd-mode electric fields at the CPS line though the CPW feed line. The proposed antenna can be used in multiband operation with directional radiation patterns whose front-to-back ratios approximate to 10 dB for desired bands. Its impedance bandwidth, determined by -10-dB reflection coefficient, covers numbers of present wireless communication systems, and the antenna can be simply integrated with other circuit components for its planar structure. Experimental data obtained from a laboratory prototype are also presented. The experimental results confirm the good performances observed by the electromagnetic simulations.
Keywords :
Yagi antenna arrays; antenna feeds; antenna radiation patterns; coplanar waveguides; directive antennas; electric impedance; electromagnetic wave reflection; multifrequency antennas; planar antennas; strip lines; CPW feed line; CPW-to-CPS transition; coplanar waveguide-fed planar quasiYagi antenna; coplanar-waveguide-to-coplanar-strip transition; directional radiation pattern; electromagnetic simulation; impedance bandwidth; multiband operation; odd-mode electric field; reflection coefficient; wireless communication system; Antenna measurements; Antenna radiation patterns; Coplanar waveguides; Dipole antennas; Resonant frequency; Transmission line measurements; Coplanar-waveguide-to-coplanar-strip (CPW-to-CPS) transition; multiband antenna; quasi-Yagi antenna;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2011.2170950
